Improvement in whiffletree-couplings



H. K. PORTER. y Whffletree-Coupling.

No. 221,471. Patented Nov.11,1879.

UNITED STATES PATENT OEEIGE.

HENRY K. PORTER, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN WHIFFLETfREE-COUPLINGS.

Specification forming part of Letters Patent No. 221.471, dated November 11, 1879; applic-ation filed March 14, 1879.

To all whom it may concern:

Be it known that I, HENRY K. PORTER, of the city of Boston, State of Massachusetts, have invented an Improved Whiflletree-Oenter, of which the following is a specification.

The object of my invention is to produce a whifliet-ree center or coupling at a minimum of cost which shall have the largest possible bearing and wearing surface within a given area of cross-section, and which shall not by wearing become loose, bnt shall by such wearing tend to more perfectly lit the corresponding faces together; and the invention consists in a coupling formed of two members, to be respectively secured in the usual manner to the cross-bar and whifetree, each of said members havin g formed thereon a circular rim or wall ot' such respective diameter that one rim or wall fits within the other, while within the larger or outer wall is formed a hollow truncated cone, and within the smaller or interior rim or wall is formed a chamber corresponding with the said cone in the other half, while from the center of such chamber, and surrounding the pivotal bolt-hole, is formed a thimble, which tits into the aperture in the said truncated cone, all as will by the aid of the accompanyingdrawings be fully described.

Figure l is an under-side or inverted-plan view of the member which is secured to the whiftletree. Fig. 2 is a plan or top view ot' the member which is secured to the cross-bar. Fig. 3 is a central vertical section taken longitudinally through the cross-bar and whiflietree and through the coupling. Fig. 4 is a detached section, showing the upper or Whitfietrce member of the coupling taken as in Fig. 3 and Fig. 5 is a similar section of the under or cross-bar memberot the coupling.

In these views, A is the cross-bar. B is the C is the member of the coupling attached to the cross-bar, and D is the member secured to the whiftletree. These meinbers may be formed with the ears j, for connection with the whifdetree and cross-bar, or with any desired means for attachment to such parts.

ctc represent thecircular rim formed on member D. b b show the wall of the cone. c is the hole through the cone, and d d a circular groove in the back ofthe plate to obviate superfluous metal. c e show the outer wall ot' the circular rim on plate C, which tits into rim a, formed on plate D. f f show the wall of the conical chamber formed inside the wall c e. g g show the thimble which surrounds the hole l1, which receives ythe whiftletree-bolt 7c.

The hole c in plate D receives the thimble g, as shown.

The wa-ll or face c retiring or slanting back as it rises, with a corresponding line inside rim c, and the thimble g, with the walls of hole c, being similarly formed, thereforelthe wear by use upon all parts of the center, and especially upon the cones, tends constantly to improve or maintain the contact and ttting together ofthe corresponding faces of the two parts ot' which the center is composed.

I claim as my invention- 1. In a whifdetree-center having two parts or members, O D, the cone b in one of such members and the corresponding concentric wallfin the other member, and both outside ofthe inclosing-walls of the respective center passages, c h, substantially as specified.

2. ln a whifiietree-center having two parts or members, O D, the combination, with cone b in one part and the corresponding wall f in the other part, of the concentric rim a, and the corresponding wall e, to t within rim a, substantially as specied.

3. In a whifdetree-center having two parts, O D, the combination, with a cone, b, in one part, and having a passage, c, through its center, and the concentric wall f in the other part, ofthe thiinble g, to t the passage c in such cone, substantially as specied.

4. In a whiletree-center having two parts, O D, the combination of concentric rim a, Wall e, cone b, wall j', and thimble g, all substantially as specied.

HENRY K. PORTER.

` Witnesses EUGENE HUMPHREY, T. W. PORTER. 

